58results about How to "Lower energy storage costs" patented technology

The invention discloses a cold-heat combined supply solar thermochemical adsorption composite energy storing device in the technical field of solar photo-thermal conversion utilization. A solar heat collector, a heat collector heat-transfer fluid adjusting valve, a high-temperature heat-transfer fluid circulating pump and a reactor heat exchange coil are circularly connected; a cooling tower, a cooling tower heat-transfer fluid adjusting valve, a low-temperature heat-transfer fluid circulating pump and a liquid accumulator heat exchange coil are circularly connected; a solid-gas chemical reactor, a refrigerant adjusting valve and a refrigerant accumulator are connected; the reactor heat exchange coil, a heat user side adjusting valve, a heat user side and the high-temperature heat-transfer fluid circulating pump are connected; the liquid accumulator heat exchange coil, a color user side adjusting valve, a color user side and the low-temperature heat-transfer fluid circulating pump are connected; the liquid accumulator heat exchange coil, the cooling tower, the cooling tower heat-transfer fluid adjusting valve and the low-temperature heat-transfer fluid circulating pump are circularly connected; and the refrigerant accumulator, the refrigerant adjusting valve and the solid-gas chemical reactor are connected. The device has high energy storage density and can realize cold-heat combined supply and simultaneous storage of heat and cold.

The invention discloses a method for improving wind power absorption ability of an electric power system through electricity-to-gas energy storage technology. The method comprises steps of predicting system load at the t period before the day and wind power output at the t period before the day; by taking the principle that the wind power obtained through the prediction is absorbed in a minimal wind abandon mode by the system, setting a calling scheme I for optimizing the wind power absorption ability; and judging whether to translate load participation, solve translatable load, require an electricity-to-gas energy storage device to work and start an electricity-gas energy storage. According to the invention, parts of wind and electricity can be absorbed through the electricity-to-gas device when the wind power output is too big; impacts on the electric power system are reduced; obtained man-made natural gas can be directly stored and transported in a natural gas system; requirements on energy storage cells are reduced; and energy storage cost is reduced. On the other hand, the natural gas can provide a part of heat load, so pressure of a thermal power plant is reduced.

The invention relates to a direct current microgrid, specifically relates to a power pool-based dual-layer bus direct microgrid and a control method therefor, and solves the problems of high energy conversion loss and low system operating efficiency of the existing single-bus direct current microgrid, and high probability of power interference and poor system operating economy of the existing dual-bus direct current microgrid. The power pool-based dual-layer bus direct microgrid comprises an energy storage voltage regulation system, a direct current sub grid I and a direct current sub grid II, wherein the energy storage voltage regulation system comprises a power pool, a lithium battery pack, a DC / DC converter I, a DC / DC converter II and a DC / DC converter III; the power pool comprises a supercapacitor and a middle bus in parallel; the direct current sub grid I comprises a photovoltaic power generation unit I, a direct current load I and a direct current bus I; the direct current sub grid II comprises a photovoltaic power generation unit II, a direct current load II and a direct current bus II; and the direct current sub grid I and the direct current sub grid II have different voltage levels. The power pool-based dual-layer bus direct microgrid is applicable to a variety of fields.

The invention discloses solid gravity flow carrying equipment, gravity energy storage elements and an energy storage system. The solid gravity flow carrying equipment comprises a transfer track, wherein the transfer track is provided with a low-altitude section, a high-altitude section opposite to the low-altitude section and an inclined section, and the transfer track is used for enabling the gravity energy storage elements to directionally move; a plurality of pushing mechanisms are arranged side by side along the inclined section of the transfer track; electric and kinetic energy conversion mechanisms are connected with the pushing mechanisms; the plurality of pushing mechanisms are driven by the corresponding electric and kinetic energy conversion mechanisms to move and drive the plurality of gravity energy storage elements to be continuously pushed to the high-altitude section from the low-altitude section along the inclined section; or the plurality of pushing mechanisms move through the gravity action of the plurality of gravity energy storage elements and drive the corresponding electric and kinetic energy conversion mechanisms to convert the mechanical kinetic energy into the electric energy, and the gravity action is formed in the mode that the gravity energy storage elements are continuously pushed from the high-altitude section to the low-altitude section along the inclined section to slide downwards. The problems that in the prior art, the terrain requirement is high, and the applicability is not high are solved.

The invention relates to a business park source-storage-load optimized configuration method comprising the steps as follows: (1) building a controllable air conditioning cold / heat load optimized regulation model; (2) getting a business park photovoltaic power generation system output curve; (3) determining an energy storage system charge and discharge strategy; (4) building a business park source-storage-load optimized configuration model; and (5) calculating the desired charge and discharge power values of an energy storage battery at each moment of time. According to the invention, an air conditioning load is used as virtual energy storage based on the controllability thereof in order to reduce the capacity of a required energy storage system, and the minimum cost for users to purchase electricity from a large grid is taken as an objective function to realize timely consumption of photovoltaic energy to the maximum, so the investment cost on energy storage is reduced, and the electricity charge is saved for users. The method is of high economic feasibility.

The invention discloses a system and a method for balancing power grid load. The power grid load balancing system comprises a power grid balancing control backstage, a charging induction terminal and a charging station, wherein the power grid balancing control backstage is used for obtaining real-time parameters of a power grid and the real-time power price, and sending out the power price; the charging induction terminal is used for obtaining the real-time power price and judging whether the equipment to be charged is to be charged; and the charging station is used for providing a charging platform. The method for balancing power grid load comprises the steps of: obtaining the real-time parameters of the power grid after balancing control of the power grid, and obtaining the real-time price and sending out the real-time price; providing the charging station, receiving the real-time power price, and adjusting the power price according to the real-time power price; and obtaining the real-time power price of an area in which the equipment to be charged is positioned. By adopting the system and the method for balancing power grid load, the information of real-time power price can be sent to a user of the equipment to be charged, users are guided to charge in power consumption trough, electric power in power consumption peak is saved, balance power grid load is benefited, the power storage cost is reduced, the energy configuration is optimized, and energy consumption is reduced.

The invention discloses a compressed air hybrid energy storage system and method applied to a miniature wind power system. Compressed air undertakes the main power fluctuation restraining task, a storage battery is used for supplementing fluctuation, difficult to track, of the compressed air, and therefore the overall response speed of the energy storage system is guaranteed, and the energy storage cost is reduced. Meanwhile, in order to improve the fast response of the compressed air energy storage system to lower and reduce the usage amount of the storage battery to the greatest extent, the compressed air energy storage system is dispatched in an advanced manner to output force, the problems of pneumatic equipment response delay and the like of the compressed air energy storage system due to mechanical inertia are effectively solved, the response speed of the compressed air energy storage system is increased, the usage amount of the storage battery is reduced, and the overall economic performance of the system is enhanced.

Embodiments of the invention provide a micro-energy net system and a micro-energy net configuration method and apparatus. The system comprises a solar energy heat collection device, a combined heat and power generation unit and a biogas device; the solar energy heat collection device heats biogas slurry in the biogas device through a heat supply circulation pipeline to generate biogas; the biogasin the biogas device is input to the combined heat and power generation unit through a gas guide pipe for enabling the combined heat and power generation unit to generate power; and residual heat generated by power generation of the combined heat and power generation unit heats the biogas slurry in the biogas device through a residual heat recycling pipeline. A storage battery, and the like powerstorage apparatuses are not needed, so that the energy storage cost is reduced; solar energy and the biogas are taken as energy sources; different energy source forms are mutually coupled in differentphysical connection modes to realize multi-energy source complementation; load demands in multiple forms of power, heat, gas and the like are provided for users; and a complementary characteristic ofthe solar energy and the biogas improves the flexibility of micro-energy net operation to a certain extent and reduces the energy utilization cost of the users.

The invention discloses a wind farm energy storage lithium-ion electricity optimizing control method based on set inertial energy storage, and relates to a wind farm hybrid energy storage system combined mode and a capacity control method thereof. The wind farm energy storage lithium-ion electricity optimizing control method based on set inertial energy storage is characterized by comprising the following steps that (1) wind farm prediction capture power in a traditional control mode is calculated according to a wind farm prediction wind speed; (2) fast Fourier transform is conducted on the wind farm prediction power, so that a wind electricity power spectral characteristic curve, an output power high-frequency signal and an output power low-frequency signal are obtained; (3) the high-frequency component for restraining active output power of a set is stored through inertial kinetic energy of the set itself when wind farm output power undergoes primary smoothing; (4) a lithium battery is used for energy storage so that a smoothing task to the low-frequency component of wind farm output power waves can be achieved; (5) an evaluation index is established, and wind farm lithium battery capacity is controlled in an optimizing mode. According to the technical scheme, electric energy quality and energy storage economic benefits can be improved, and the service life of batteries is prolonged.

The invention discloses an energy storage charge and discharge capacity control system based on a wind driven generator. The energy storage charge and discharge capacity control system comprises a monitoring data processing module, an energy storage life estimation module, a system database module, an energy storage capacity distribution module and a control execution module; through monitoring, processing, estimating, capacity allocation, and charging and discharging control, the purpose of reasonably arranging the operation of an energy storage device is achieved; the structure is simple, and the energy storage is automatically selected and controlled by combining the power generation capability of the wind power generation and by means of performing charging and discharging control on the energy storage capacity; and the service time of an energy storage unit is prolonged, and the energy storage cost is lowered.

The invention relates to a multistage Stirling engine and a steady-state operation parameter regulating and controlling method thereof. According to the multistage Stirling engine, multiple Stirling work units are formed by mechanical energy input pistons, mechanical energy transferring double-acting free pistons and mechanical energy output pistons. The mechanical energy input pistons are connected with mechanical energy input devices, and the mechanical energy output pistons are connected with mechanical energy output devices. When the Stirling engine serves as an engine, small mechanical energy is input into the mechanical energy input pistons in one group of pistons, and after the mechanical energy is amplified by the multi-stage Stirling units, large mechanical energy is output by themechanical energy output pistons. According to the multistage Stirling engine and the steady-state operation parameter regulating and controlling method thereof, a needed piston motion manner is achieved through parameter calculation, selection and designing, and therefore the multistage Stirling engine can adapt to the change of the input conditions and regulate the output power according to needs. The multistage Stirling engine is simple in structure, good in regulation performance, small in mechanical loss, small in noneffective volume and suitable for adopting large-diameter pistons, andcan be widely used for waste heat power generation and distributed energy and renewable energy power generation.

The invention discloses a flow cell battery system used for an off-grid solar power generation system. The flow cell battery system comprises a first electricity accumulating unit which is connected with a photovoltaic square matrix and a solar power charging and discharging controller, a second electricity accumulating unit which is connected with a direct current load and the solar power charging and discharging controller and is connected with an alternate current load through an inverter, an anode liquid storage tank, and a cathode liquid storage tank, wherein the anode electrolyte outlet of the first electricity accumulating unit and the anode electrolyte outlet of the second electricity accumulating unit are connected with the anode liquid storage tank; the cathode electrolyte outlet of the first electricity accumulating unit and the cathode electrolyte outlet of the second electricity accumulating unit are connected with the cathode liquid storage tank; the anode liquid storage tank is connected with the anode electrolyte inlet of the first electricity accumulating tank and the anode electrolyte inlet of the second electricity accumulating tank; the cathode liquid storage tank is connected with the cathode electrolyte inlet of the first electricity accumulating unit and the cathode electrolyte inlet of the second electricity accumulating unit. The flow cell battery system is lower in energy consumption during the discharging process.

The invention provides a data center power supply system, a power supply control method and device and a data center, and relates to the technical field of computers, in particular to the field of big data. According to the specific implementation scheme, the data center power supply system comprises a power supply module; the at least one server is connected to the output end; the energy storage module comprises a bidirectional direct-current converter, a battery pack loop and a battery management unit, a first side port of the bidirectional direct-current converter is connected with the output end of the power supply module, a second side port of the bidirectional direct-current converter is connected with the battery pack loop, and a control end of the bidirectional direct-current converter is connected with the battery management unit; and the battery management unit is used for controlling the current flowing directions of the first side port and the second side port of the bidirectional direct-current converter so as to charge the battery pack loop or enable the battery pack loop to discharge to the server. In the power supply system, the energy storage module is low in cost and flexible in configuration, and can meet the diversity requirements of the data center.

The invention discloses a power grid side energy storage optimization method and system. The method comprises the steps of obtaining power grid side energy storage data, and determining a power grid side energy storage optimization objective function according to the power grid side energy storage data; wherein the objective function considers a delayed power transmission network upgrading and reconstruction factor, a wind power consumption factor, an energy storage peak regulation factor and an energy storage system life factor; and optimizing the power grid side energy storage configurationby adopting a longicorn beard search algorithm according to the target function and the constraint condition. By the adoption of the method and system, energy storage can be reasonably configured, resource waste is reduced, and energy storage cost is reduced.

The invention provides a peak regulation heat supply system with a heat storage function and a control method. The peak regulation heat supply system comprises an electric heating furnace (1), an energy storage system (2), a heat supply system (3), a first regulating valve (5) and a second regulating valve (6). A heat-transfer medium outlet of the electric heating furnace (1) is connected to the energy storage system (2) and the heat supply system (3) by the first regulating valve (5) and the second regulating valve (6) via pipelines. According to the peak regulation heat supply system, through structural design, valley electricity can be fully used in the application of the peak regulation heat supply system with the heat storage function, peak shaving and valley filling are conducted on a power grid, thus the resource utilization ratio of electrical equipment is increased, operation of the power grid is stabilized, energy storage cost is reduced greatly, and accordingly large-scale valley electricity utilization is made to be possible.

The invention discloses a solar combined electric energy-saving and environment-friendly motor homes without a charging pile, and relates to the field of new energy automobiles. The motor homes comprises an engine, a generator, a rectifier, a direct current transformer, an inverter, a lithium battery pack, a motor and household appliances, wherein the engine provides power for power generation ofthe generator, the rectifier is used for converting alternating current output by the generator into direct current, the direct current transformer is used for conducting voltage transformation on thedirect current voltage output by the rectifier and correspondingly conveying the direct current voltage to the lithium battery pack and the inverter, the inverter is used for converting direct current output by the direct current transformer into alternating current and conveying the alternating current to the motor, the motor is used for providing power for the motor homes, a sliding folding photovoltaic panel assembly is used for charging the lithium battery pack and supplying electricity to the household appliances, and the lithium battery pack is used for supplying power to the householdappliances and providing direct current to the inverter through the direct current transformer. The combined electric power system has the following advantages that 1, a charging pile does not need tobe charged; 2, the endurance mileage is over 600 kilometers; 3, the use amount of the lithium battery is only 1 / 5-1 / 3 of a battery electric vehicle, the energy storage cost is greatly reduced, and the safety and reliability are greatly improved; and 4, the service life of the photovoltaic panel is 25 years or more, the photovoltaic panel is used by using a solar energy supply motor homes power system and an interior household appliance inside the motor homes, so that the motor homes is clean and pollution-free; and meanwhile, the later use cost is greatly saved.

The invention discloses a solar grid-connected power generation system. A power generation current of a solar power station flows through a diode to be transmitted to an inverter, an auxiliary power supply unit outputs a voltage to a controllable rectifier which is connected with the diode in parallel, an output voltage value of the solar power station is collected, and the inverter is connected with a power grid. The solar grid-connected power generation system is a device which effectively utilizes solar energy to generate power and supply energy in a photovoltaic mode, solar devices are installed on all households in cities and counties meeting requirements and various buildings to generate power in the photovoltaic mode, 30%-40% clean energy can be generated, the solar grid-connected power generation system is an effective method for achieving energy safety and eliminating PM2.5 main pollutants and is an important measure for effectively utilizing photovoltaic capacity.

The invention discloses a wind power plant energy storage capacity configuration method considering a battery operation state, an energy storage system is connected in parallel at an outlet of a wind power plant, and the energy storage system at least comprises a group of battery packs arranged in parallel in pairs, a matched energy management system and a converter connected in series with the battery packs in pairs; the configuration method comprises the following specific steps: constructing a multi-objective optimization model of energy storage system capacity configuration, which comprises an energy storage comprehensive cost model, an energy storage life evaluation model and an energy storage unbalance degree optimization model, in a scene that a battery pack group controls smooth wind power; determining constraint conditions of energy storage capacity and converter power; and solving by adopting a particle swarm algorithm. According to the energy storage capacity configuration method established by the invention, the capacity configuration optimization target is established based on the attenuation index reflecting the unbalanced state, and meanwhile, important factors such as life evaluation and comprehensive cost are considered, and the energy storage capacity configured by the method has effectiveness and superiority in the aspects of cost, service life, battery unbalanced state and the like.

The invention discloses a cold-heat combined supply solar thermochemical adsorption composite energy storing device in the technical field of solar photo-thermal conversion utilization. A solar heat collector, a heat collector heat-transfer fluid adjusting valve, a high-temperature heat-transfer fluid circulating pump and a reactor heat exchange coil are circularly connected; a cooling tower, a cooling tower heat-transfer fluid adjusting valve, a low-temperature heat-transfer fluid circulating pump and a liquid accumulator heat exchange coil are circularly connected; a solid-gas chemical reactor, a refrigerant adjusting valve and a refrigerant accumulator are connected; the reactor heat exchange coil, a heat user side adjusting valve, a heat user side and the high-temperature heat-transfer fluid circulating pump are connected; the liquid accumulator heat exchange coil, a color user side adjusting valve, a color user side and the low-temperature heat-transfer fluid circulating pump are connected; the liquid accumulator heat exchange coil, the cooling tower, the cooling tower heat-transfer fluid adjusting valve and the low-temperature heat-transfer fluid circulating pump are circularly connected; and the refrigerant accumulator, the refrigerant adjusting valve and the solid-gas chemical reactor are connected. The device has high energy storage density and can realize cold-heat combined supply and simultaneous storage of heat and cold.

The invention relates to a compressed air energy storage system and an offshore converter platform with a compressed air energy storage function. The invention aims to overcome the problems of high randomness and insufficient stability of large-capacity wind power output caused by the fact that large-scale wind power is sent out through a converter station. According to the technical scheme, the compressed air energy storage system is provided with an air storage tank, a plurality of air compressors, a plurality of gas turbines and a power generator / motor which can drive the air compressors towork and can be driven by the gas turbines to generate power; the air compressors are sequentially connected in series, and air outlets of the air compressors connected in series are in pipeline connection with the air storage tank sequentially through an air compressor air outlet pipe valve, a cooler and an air storage tank air inlet pipe valve; the gas storage tank is sequentially connected with a plurality of gas turbines sequentially connected in series through a combustion chamber gas inlet pipe valve, a combustion chamber and a gas turbine gas inlet pipe valve pipeline. The invention isapplicable to the technical fields of green energy power generation technology and marine resource comprehensive application, and is particularly applicable to the fields of new energy such as offshore wind energy and the like and marine ranch aquaculture.

The invention discloses a capacity optimization configuration method for shared energy storage of new energy power stations, a new energy power station group distributed shared energy storage architecture applying the method comprises a plurality of new energy power stations, energy storage devices corresponding to the new energy power stations, a pooling station and a power grid, and the pooling station performs energy and information transmission with the new energy power stations. The pooling station is connected to a power grid; the capacity optimization configuration method comprises the following steps: S1, designing an energy storage sharing mechanism based on a new energy power station group distributed shared energy storage architecture; s2, establishing a new energy power station group distributed shared energy storage cooperative game model considering factors such as on-grid electricity revenue and shared energy storage revenue; and S3, taking new energy power station group sharing in the same pooling station environment as a scene, taking the energy storage capacity constructed by each new energy power station as a decision variable, and solving an energy storage optimization configuration result by using a particle swarm algorithm. The pressure of power grid dispatching is reduced, and the energy storage cost and the construction scale are reduced.

The invention discloses a flow cell battery system used for an off-grid solar power generation system. The flow cell battery system comprises a first electricity accumulating unit which is connected with a photovoltaic square matrix and a solar power charging and discharging controller, a second electricity accumulating unit which is connected with a direct current load and the solar power charging and discharging controller and is connected with an alternate current load through an inverter, an anode liquid storage tank, and a cathode liquid storage tank, wherein the anode electrolyte outlet of the first electricity accumulating unit and the anode electrolyte outlet of the second electricity accumulating unit are connected with the anode liquid storage tank; the cathode electrolyte outlet of the first electricity accumulating unit and the cathode electrolyte outlet of the second electricity accumulating unit are connected with the cathode liquid storage tank; the anode liquid storage tank is connected with the anode electrolyte inlet of the first electricity accumulating tank and the anode electrolyte inlet of the second electricity accumulating tank; the cathode liquid storage tank is connected with the cathode electrolyte inlet of the first electricity accumulating unit and the cathode electrolyte inlet of the second electricity accumulating unit. The flow cell battery system is lower in energy consumption during the discharging process.

The system comprises a controller, an alternating current power grid, at least one photovoltaic module, an inverter, an alternating current bus, an alternating current power distribution cabinet, a direct current bus, an alternating current-to-direct current circuit, a direct current-to-direct current circuit and energy storage equipment, the alternating-current power grid is connected with the alternating-current bus; the photovoltaic module is connected with the inverter, the inverter is connected with the alternating-current bus, the alternating-current power distribution cabinet is connected with the alternating-current bus and the alternating-current-to-direct-current circuit, and the alternating-current-to-direct-current circuit is connected with the direct-current bus; the DC bus is connected with the DC-to-DC circuit; the DC-to-DC circuit is connected with the energy storage equipment; the controller is used for adjusting the energy storage device to be in a charging state or a discharging state according to the output total power of the photovoltaic module, the load total power and the load state of the alternating current power grid. By using the optical storage system provided by the invention, on the premise of reducing the optical stacking transformation cost, the difficulty of optical stacking transformation is simplified.

The invention provides a solar household total-energy system and belongs to application of solar energy. The solar household total-energy system comprises a vacuum pipe air heat collecting device 1, alinear focusing heat collecting device 2, a first circulating pump 3, a heat storage device 4, a second circulating pump 8, a low-temperature heat machine 9, an engine 10, a third circulating pump 11, a solar cooker 12, a fourth circulating pump 13, a solar air conditioner 15 and a solar heating device 17. The vacuum pipe air heat collecting device 1 is connected with the lower end of the heat storage device 4 through the linear focusing heat collecting device 2 and the first circulating pump 3, the upper end of the heat storage device 4 is connected with the lower end of the vacuum pipe airheat collecting device 1 through a pipeline, and a heat collecting and storage circulating loop is constituted. The heat storage device supplies heat to the low-temperature heat machine through the second circulating pump to enable the engine to generate power, heat energy is supplied to the solar cooker through the third circulating pump, and heat is supplied to the air conditioner and the heating device through the fourth circulating pump. The solar household total-energy system is efficient and low in cost, can serve as household alternative energy, and is economical, environmentally friendly and convenient to use.

The invention discloses a steam energy storage device utilizing off-peak electricity and a control method thereof. The device comprises a heat pump, a conveying pump, an electric boiler, a booster pump, a storage tank and a first pressure reducing valve, and the first pressure reducing valve communicates with an external demand pipe network; the steam energy storage device is connected with a controller. The method comprises the following steps that power consumption information of an external demand pipe network area is obtained through the controller so as to control the starting time and the closing time of the steam energy storage device; heat demand information of an external demand pipe network is obtained, and water at different temperatures is provided for users through the steam energy storage device. The steam energy storage device utilizing the off-peak electricity aims at solving the problem that the starting time of an off-peak electricity energy storage device is short of scientific management and control, and electric energy is stored in the actual electricity utilization off-peak period.

The invention provides a low-melting-point salt and water combined energy level utilizing system for peak shaving of thermal unit, belongs to the field of thermal power plant flexible converting, andaims at solving the existing problem of higher energy saving cost when a melting salt is solely taken as an energy storage medium. The system comprises a temperature and pressure adjusting device, a saline water heat exchange device, a cold salt tank and a hot salt tank, boiler main steam is connected with a medium inlet of the saline water heat exchange device passing through a first air pipe, the water energy storage system comprises a water-water heat exchange device and a hot water storage tank, a medium outlet of the saline heat exchange device is connected with a medium inlet of the water-water heat exchange device through a second connecting pipe, a hot water supplying system comprises a water source and a heating device, and a high-temperature melting salt heat exchange system comprises an evaporator or a steam heating device. The system has the advantages that classification storage and classification utilization of energy are conducted, the energy storage cost can be effectively reduced through the water energy storage system when same energy is stored, and the effectiveness of a high grade thermal source can be maintained through the low-melting-point, melting salt energy storage system.

The invention relates to a direct current microgrid, specifically relates to a power pool-based dual-layer bus direct microgrid and a control method therefor, and solves the problems of high energy conversion loss and low system operating efficiency of the existing single-bus direct current microgrid, and high probability of power interference and poor system operating economy of the existing dual-bus direct current microgrid. The power pool-based dual-layer bus direct microgrid comprises an energy storage voltage regulation system, a direct current sub grid I and a direct current sub grid II, wherein the energy storage voltage regulation system comprises a power pool, a lithium battery pack, a DC / DC converter I, a DC / DC converter II and a DC / DC converter III; the power pool comprises a supercapacitor and a middle bus in parallel; the direct current sub grid I comprises a photovoltaic power generation unit I, a direct current load I and a direct current bus I; the direct current sub grid II comprises a photovoltaic power generation unit II, a direct current load II and a direct current bus II; and the direct current sub grid I and the direct current sub grid II have different voltage levels. The power pool-based dual-layer bus direct microgrid is applicable to a variety of fields.

The invention discloses an energy storage system charging and discharging control method for smoothing photovoltaic power fluctuation, and the method comprises the following steps: S1, obtaining userload data and photovoltaic output data in a power distribution network, and configuring a hybrid energy storage system according to the collected data; S2, giving a transformer capacity reduction value [delta], setting an initial value k0 of a waveform forming coefficient, and calculating the maximum charging and discharging power value and the minimum energy value of the energy storage device according to an energy storage parameter calculation method; S3, obtaining a daily net load value by subtracting the value of the adjusting photovoltaic output curve from a daily load curve; S4, obtaining the maximum charging and discharging power value and the minimum energy value of the energy storage device according to the configuration method of the energy storage device; and S5, finding the optimal cost allocation when the transformer capacity is reduced by [delta] by analyzing the change of the k0 waveform coefficient. According to the technical scheme, fluctuation of photovoltaic output can be stabilized, the user load peak-valley difference is reduced, and the energy storage cost is well optimized.

The invention provides an energy storage module, an energy storage device and a power generation system. The energy storage module comprises a first battery cell, a second battery cell and an air duct structural part, an air duct is arranged in the air duct structural part, the air duct structural part comprises an air inlet end and an air outlet end which are located at the two ends of the air duct, and the first battery cell and the second battery cell are arranged outside the air duct structural part and sequentially arranged between the air inlet end and the air outlet end. The air duct structural part comprises a first air duct area and a second air duct area, the first air duct area corresponds to the first battery cell, the second air duct area corresponds to the second battery cell, and the heat dissipation area in unit volume of the second air duct area is larger than that in unit volume of the first air duct area, so that the temperature difference between the second battery cell and the first battery cell is reduced. The heat dissipation area in the unit volume of the second air duct area is set to be larger than the heat dissipation area in the unit volume of the first air duct region, so that the problem that the temperature difference between the second battery cell and the first battery cell is too large can be solved.

The invention discloses a solar intermediate temperate heat collection and storage system and belongs to solar application. The solar intermediate temperate heat collection and storage system comprises an evacuated tube heat collector (1), a linear focusing heat collector (2), a circulating pump (3), a heat storage device (4), a flow diffusing pipe (5), heat storage balls (6) and a convergence layer (7); the heat storage device is a box body which is provided with a heat insulation layer in all directions; the lower end of the box body is provided with the flow diffusing pipe, the heat storageballs are located above the flow diffusing pipe, and the convergence layer is located above the heat storage balls; the flow diffusing pipe is in a tree shape composed of a main pipe and branch pipesand is provided with a plurality of pores; the upper end of the evacuated tube heat collector is connected with the lower end of the heat storage device through the linear focusing heat collector andthe circulating pump, the upper end of the heat storage device is connected with the lower end of the evacuated tube heat collector, and a heat collection and storage circulating loop is formed; andair serves as a heat transfer medium of the system. The solar intermediate temperate heat collection and storage system utilizes the air for heat transfer, utilizes concrete for energy storage and isthe highest in heat collection efficiency, the lowest in energy storage cost, capable of being suitable for multiple solar products and wide in application range.